Snap Peas in Zone 7B — Pacific Northwest

Snap peas are a delightful addition to any Pacific Northwest garden. Their crisp, sweet pods are delicious raw, stir-fried, or lightly steamed. Plus, they're incredibly rewarding to grow, offering a taste of homegrown goodness that's hard to beat, especially with our cool nights that enhance their sweetness.

While we may not have the long, scorching summers of other regions, our 193-day growing season gives us plenty of time to enjoy snap peas. By choosing the right varieties and planting at the correct times, you can easily overcome potential challenges like cool spring soil and extend your harvest well into the fall.

If you're starting snap peas indoors, aim to transplant them outdoors from mid-March through mid-April. Before planting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the temperature swings and sunlight intensity that are common in our spring weather.

Space the transplants about 3-4 inches apart, just like you would if direct sowing. Keep an eye on the weather forecast, as late frosts can still occur during this time. Be ready to cover your young plants if a cold snap is predicted.

Direct sowing is the preferred method for snap peas, and it's easy to do in the Pacific Northwest. You can sow seeds directly into the garden from early March through mid August. Snap peas are pretty forgiving.

Before sowing, make sure your soil is well-drained and workable. Amend with compost to improve fertility and drainage. Sow seeds about 1 inch deep and 3-4 inches apart. Keep the soil consistently moist until germination, which usually takes about a week or two, depending on soil temperature. Just like garden peas, get them in the ground early.

Snap peas thrive with consistent moisture, especially during pod development. Since our summers are mild and dry, you'll need to pay attention to watering, but it's usually not as demanding as in hotter climates. Aim for about 1 inch of water per week, either from rainfall or irrigation.

The finger test is your best friend: stick your finger about 2 inches deep into the soil near the base of the plants. If it feels dry, it's time to water. Water at the base of the plants to avoid wetting the foliage, which can encourage fungal diseases in our sometimes-damp spring weather. Overhead watering is fine, though, during our dry summer months.

Signs of underwatering include wilting leaves and small, underdeveloped pods. Overwatering, on the other hand, can lead to yellowing leaves and root rot. A layer of mulch, such as straw or wood chips, can help retain moisture and regulate soil temperature.

Snap peas are vining plants and need support to climb. A trellis, chicken wire, or even a sturdy pea brush works well. Aim for a support structure that is 4-6 feet tall.

Install the support at planting time to avoid disturbing the roots later. As the plants grow, gently guide the vines onto the support, encouraging them to climb. They'll usually grab on their own with their tendrils.

You can expect your first harvest of snap peas from early May through early November, about 60 days after planting. The key is to harvest when the pods are plump and crisp with fully developed peas inside. The entire pod should be tender and easy to snap.

Harvest regularly to encourage continued production. Use scissors or pruning shears to snip the pods from the vine, being careful not to damage the plant. As the end of the season approaches in late October, harvest any remaining pods before the first frost.

Here are some common problems you might encounter with snap peas in the Pacific Northwest:

Powdery Mildew

• What it looks like: White or grayish powdery coating on leaves, stems. Leaves curl, yellow, and die.
• What causes it: Fungi thriving in warm days, cool nights, and moderate humidity. Dry leaf surfaces favor it.
• How to fix/prevent it: Improve air circulation through spacing and pruning. Remove affected leaves. Neem oil or potassium bicarbonate sprays help. Milk spray (1 part milk to 9 parts water) is surprisingly effective. Plant resistant varieties.

Pea Aphids

• What it looks like: Clusters of small, soft-bodied green insects on stems, leaves, and pods. Distorted growth, sticky honeydew, and sooty mold.
• What causes it: Aphids are attracted to stressed plants. They reproduce quickly in mild weather.
• How to fix/prevent it: Blast aphids off plants with a strong stream of water. Introduce beneficial insects like ladybugs and lacewings. Insecticidal soap or neem oil can be used for heavy infestations.

Root Rot

• What it looks like: Yellowing leaves, stunted growth, wilting, and mushy brown roots.
• What causes it: Overwatering, poorly drained soil, and fungal pathogens like *Pythium* and *Phytophthora*. Our wet springs can exacerbate this.
• How to fix/prevent it: Improve soil drainage by adding compost and avoiding overwatering. Plant in raised beds if necessary. Use well-draining potting mix for containers.

Fusarium Wilt

• What it looks like: Wilting on one side of the plant first, then spreading. Yellow leaves starting on one side. Brown streaks in stem when cut open.
• What causes it: Soil-borne fungus (Fusarium oxysporum). Persists in soil for years. Enters through roots. Warm soil temperatures favor it.
• How to fix/prevent it: No cure once infected — remove and destroy the plant. Plant resistant varieties (look for 'F' on seed labels). Rotate crops on a 4-year cycle. Solarize soil in hot zones. Raise soil pH above 6.5.

Pacific Northwest Specific Challenges: Our mild heat and dry-summer conditions mean that snap peas are generally less susceptible to heat stress than in other regions. However, late blight, which can affect other plants in your garden, can sometimes spread to snap peas, so it's important to monitor your plants regularly. Slugs can also be a nuisance, especially in wet springs, so use slug bait or other control methods as needed.

Companion planting can help your snap peas thrive. Carrots and radishes are good companions because they help break up the soil, making it easier for snap peas to establish their roots. Cucumbers and corn provide support for the vines to climb, while lettuce provides ground cover that helps retain moisture and suppress weeds.

Avoid planting snap peas near onions or garlic, as these can inhibit their growth. Onions and garlic release allicin, which is a natural fungicide that can harm beneficial soil microbes that snap peas rely on.